Back child support in Illinois is enforceable indefinitely, with no statute of limitations since the law changed on July 1, 1997. Past-due child support, called arrears, can accrue simple interest at 9% per year under 735 ILCS 5/12-109, and enforcement powers including license suspension, passport denial, wage garnishment, and contempt survive even after the child turns 18. This guide explains how child support debt is calculated, collected, and resolved in Illinois as of 2026.
Key Facts: Back Child Support in Illinois
| Factor | Illinois Rule |
|---|---|
| Statute of Limitations | None — arrears enforceable at any time (735 ILCS 5/12-108(a)) |
| Interest Rate | 9% per annum simple interest (735 ILCS 5/12-109) |
| Interest Automatic? | No — requires court order/request as of 2024 |
| Governing Statute | 750 ILCS 5/505 (Illinois Marriage and Dissolution of Marriage Act) |
| License Suspension Trigger | 90+ days delinquent or arrears equal to 90 days' obligation |
| Passport Denial Threshold | $2,500 in arrears (42 U.S.C. § 652(k)) |
| Enforcement After Age 18 | Yes — survives emancipation (750 ILCS 5/505(i)) |
| Filing Fee (Petition for Rule to Show Cause) | Varies by county; verify with circuit clerk |
What Is Back Child Support in Illinois?
Back child support in Illinois is the total amount of court-ordered support a parent failed to pay when it was due, legally called arrears or a delinquency. Under 750 ILCS 5/505(g), every support order must state that its termination date does not apply to any arrearage remaining unpaid. This means the debt is a fixed money judgment that does not expire, vanish, or reduce simply because circumstances changed.
Past due child support accumulates each month a payment is missed or only partially paid. Illinois treats each unpaid installment as a separate judgment by operation of law, meaning a custodial parent does not need to return to court to convert missed payments into an enforceable debt. The arrears become collectible immediately. Child support debt in Illinois can include the principal amount owed, statutory interest, and in some cases medical support or daycare costs the order required the obligor to cover.
Is There a Statute of Limitations on Back Child Support in Illinois?
There is no statute of limitations on back child support in Illinois. The Illinois Legislature abolished the prior 20-year limitations period effective July 1, 1997, and under 735 ILCS 5/12-108(a), child support judgments, including those arising by operation of law, may be enforced at any time. A parent who owes child support arrears can be pursued decades later, even after the child reaches adulthood.
This rule distinguishes child support from most other Illinois money judgments, which generally expire seven years after the cause of action arose under the same statute. The Legislature carved out child support specifically because the old time limits encouraged nonpayment. A custodial parent owed past due child support from the 1990s can still file to collect that debt in 2026. Enforcement remedies — wage garnishment, tax intercepts, license suspension, and contempt — remain available indefinitely until the arrears, including accrued interest, are paid in full. The only practical limits are evidentiary: proving the historical balance through payment records, clerk ledgers, or Illinois Department of Healthcare and Family Services (HFS) account histories.
How Much Interest Accrues on Child Support Arrears in Illinois?
Child support arrears in Illinois accrue simple interest at 9% per year under 735 ILCS 5/12-109. As of 2024, this interest is no longer automatic — the custodial parent generally must request it through a court order rather than having it apply by default. Interest is calculated on the unpaid principal, not compounded, and can substantially inflate a long-standing child support debt over time.
For example, a parent who owes $30,000 in past due child support could accrue $2,700 in interest in a single year at the 9% statutory rate. Over a decade of nonpayment, simple interest alone can approach or exceed the original principal. Illinois HFS adjudicates interest under specific criteria, typically at case closure upon a timely request, and interest is collected as if it were child support. Importantly, interest is not paid out to the recipient until all principal balances are satisfied first. While interest is collectible using the same tools as the underlying child support debt, it is treated as a separate component of the obligation. Parents who owe child support should request a current statement of account to understand exactly how much principal versus interest they owe.
How Is Back Child Support Enforced in Illinois?
Illinois enforces back child support through a layered system administered by the Division of Child Support Services (DCSS) and the circuit courts. The most common first step is income withholding (wage garnishment), which can capture up to 50-65% of disposable earnings under federal limits. DCSS and custodial parents can also intercept state and federal tax refunds, place liens on property, and report the child support debt to credit bureaus by court order.
Under 750 ILCS 5/505(i), Illinois courts do not lose the powers of contempt, driver's license suspension, or other enforcement mechanisms — including criminal prosecution — when the child is emancipated. The agency typically escalates gradually, starting with wage garnishment and reserving harsher remedies like criminal referral for persistent nonpayment. Enforcement tools available for past due child support in Illinois include wage withholding, tax refund interception, bank account levies, property liens, driver's and professional license suspension, passport denial, contempt proceedings, and listing on the HFS Delinquent Parents website. A custodial parent owed arrears can pursue enforcement independently or through DCSS, which provides free enforcement services to parents who open a case.
Can a Driver's License Be Suspended for Owing Child Support in Illinois?
Yes — Illinois can suspend a parent's driver's license when they are 90 or more days delinquent in child support or have been adjudicated in arrears equal to at least 90 days' obligation, under 750 ILCS 5/505. The Illinois Family Financial Responsibility Law authorizes suspension through either a contempt finding or an administrative process, and the suspension lasts until the court determines the parent is in compliance with the support order.
Illinois provides two pathways. In the contempt-based process, the court certifies a Record of Non-Payment to the Secretary of State, who loads the pending suspension onto the driving record. Alternatively, a judge may suspend the license administratively without a contempt finding, in which case the parent receives a separate notice and has the right to request a court hearing to contest compliance within 45 days. The suspension process was revised effective August 9, 2019, under Public Act 101-0336. Beyond driving privileges, professional and occupational licenses — including those for nurses, contractors, and attorneys — can also be suspended for child support debt. A parent facing license suspension can usually restore their license by paying the arrears in full or entering a court-approved payment plan and demonstrating compliance.
Can You Lose Your Passport for Back Child Support in Illinois?
Yes — a parent who owes more than $2,500 in back child support will be reported to the U.S. State Department, which can deny a new passport application or renewal under 42 U.S.C. § 652(k). This federal threshold applies nationwide, including Illinois, and the restriction remains in place until the parent makes arrangements to address the child support debt through the state agency.
The passport denial process operates through the federal Passport Denial Program. When a parent's Illinois arrears reach the $2,500 threshold, the state reports the debt to the federal Office of Child Support Enforcement, which transmits it to the State Department. Once flagged, the parent cannot obtain or renew a passport even for unrelated travel until they resolve the arrears. Resolution typically requires paying the past due child support down below the threshold or negotiating a satisfactory payment arrangement with DCSS. Because federal processing can take weeks after payment, a parent who owes child support and needs to travel should resolve the arrears well in advance. This remedy is particularly significant for parents with work or family obligations abroad, making passport denial one of the more powerful federal enforcement tools tied to Illinois child support debt.
Can You Go to Jail for Not Paying Child Support in Illinois?
Yes — a parent can be jailed in Illinois for willfully refusing to pay child support when they have the ability to do so, through civil contempt or criminal prosecution. Under Illinois law, the court presumes a parent has the ability to pay court-ordered support unless the order was based on a default judgment, placing the burden on the delinquent parent to prove an inability to pay rather than a willful refusal.
Illinois courts use two judicial enforcement tools. In civil contempt, a parent found in willful violation may be jailed until they comply, often by paying a "purge" amount the court sets. The custodial parent can also ask the judge to order the contemnor to pay their attorney's fees and court costs. Criminal prosecution is available under Illinois law and the federal Deadbeat Parents Punishment Act, 18 U.S.C. § 228, for willful nonpayment. Penalties — jail time, fines, or both — depend on the amount of arrears, how long the parent has not paid, and whether the parent left Illinois to avoid payment. A parent who lost a job or faced genuine financial hardship should promptly explain this to the judge and file to modify support, because even a valid hardship explanation does not erase the past due child support already owed.
Does Back Child Support Continue After a Child Turns 18 in Illinois?
Yes — back child support survives the child's 18th birthday in Illinois. Under 750 ILCS 5/505(g), a support order's termination date does not apply to any arrearage that remains unpaid on that date. Only the obligation to make future payments ends at emancipation; the accumulated child support debt remains a fully enforceable judgment that the custodial parent can collect indefinitely.
Illinois law also provides for automatic continuation of payments toward arrears. Under 750 ILCS 5/505, if an unpaid arrearage equal to at least one month's support obligation exists on the termination date, the prior monthly support amount automatically continues — not as current support, but as a periodic payment toward satisfying the arrears. This continuation payment is in addition to any prior arrearage payment already ordered, and it can be enforced and collected by any lawful child support enforcement method, including income withholding. Because 750 ILCS 5/505(i) preserves contempt, license suspension, and criminal enforcement after emancipation, a parent who owes child support cannot escape the debt by waiting for the child to become an adult. The arrears, plus any court-ordered interest, follow the obligor until paid in full.
How Do You File to Collect Back Child Support in Illinois?
To collect back child support in Illinois, the custodial parent files a Petition for Rule to Show Cause or a motion to enforce in the circuit court of the county that issued the original support order. This petition asks the court to find the non-paying parent in contempt for willfully disobeying the order. Filing fees vary by county because no statewide fixed fee exists for post-judgment enforcement motions, so parents must verify the cost with their local circuit clerk.
The enforcement process generally follows these steps:
- Gather payment records showing the order amount, payments made, and the resulting arrears balance.
- Complete a Petition for Rule to Show Cause, available through the Illinois Courts free Easy Form system for family law cases.
- E-file the petition with the circuit clerk in the county where the support order was entered, unless an e-filing exemption applies.
- Serve the other parent with notice of the contempt proceedings.
- Attend the hearing, where the court evaluates whether the nonpayment was willful and can order payment, set a purge amount, or impose enforcement remedies.
Parents who cannot afford the filing fee can request a fee waiver using the Illinois Supreme Court Easy Form, which allows filing for free or at reduced cost. Alternatively, opening a free case with Illinois DCSS lets the state pursue enforcement on the parent's behalf. As of 2026, verify the current filing fee with your local clerk, because amounts differ by county.